/Engine/Source/Runtime/Engine/Classes/Engine/SkeletalMesh.h
Checks whether the provided section is using APEX cloth. if bCheckCorrespondingSections is true disabled sections will defer to correspond sections to see if they use cloth (non-cloth sections are disabled and another section added when cloth is enabled, using this flag allows for a check on the original section to succeed)
bool IsSectionUsingCloth ( int32 InSectionIndex, bool bCheckCorrespondingSections ) const